Machine for making square-bottomed paper bags with stepwisely fed paper tubes



June 13, 1933.

BAGS WITH STEPWISELY F F. HLSCHER MACHINE FOR MAKING' SQUARE BOTTOHEDPAPER ED PAP-ER TUBES Filed Nov. 27, 1931 2 Sheets-Sheet 1 9 2 l 0., n MM 9 e 9 S 1 t e m m P. s 2

June 13, 1933. F. HLscHER MACHINE FOR MAKING SQUARE BOTTOMED PA BAGSWITH STEPWISELY FED PAPER TUBES Filedl Nov. 27, 1951 Patented June 13,1933 1,914,019

UNITED STATES PATENTOFFICE FRITZ HLSCHER, F LENGKERICH, GERMANY MACHINEFOR MAKING SQUARE-BOTTOMED PAPER BAGS WITH STEPWISELY FED PAPER TUBESApplication led November 27, 1931, Serial No. 577,623, and in GermanyNovember 28, 1930.

This invention relates to machines for wise arranged diagonal of thebottom fold making square-bottomed paper bags, esrespectively. peciallythose without side folders or folded A preferred constructional form ofthe intucks, and with stepwisely fed paper tube. vention has been shownin a somewhat In machines of this character up to now diagrammatic formby the4 drawings accom- 5 during the intervals in the feeding of thepanying .the specification, and wherein: paper tube at the front end ofthe same the F 1g. l is a side elevation of the main parts bottom squarehas been formed by the co` of the machine; operation of a sheet metalgauge and a re- Fig. is a still somewhat more diagramciprocating finger,pushing the paper over matic s1de elevation drawn on a larger scale, thefolding roller. By this reciprocating and in which for simplicitys sakeparts have finger in machines operating with high speed been omitted; lfrequently tearing of the paper has occurred, 1g. 3 is a partial planview showing the especially if sensitive material, such as that palr ofgrippers 1n the moment in which they one which is well known under thetrade have Just engaged the front edge of the upper name Cellophane, isused for making the layer of the paper tube; paper bag v Fig. 4 is aside view of the grippers in It is the object of this invention to avoidanother operative position; this drawback and to create an arrangement F1g. 5 1s a plan View corresponding to Fig. for preventing the danger oftearing the 3 showing the moment in which the diamond material,occurring with the high speed. fold has Just been formed by the gippers.According to the invention with this inten- It may be mentioned that inthe drawings tion one single pair of gripper-S is used, for simplicityssake such parts, which are which, during the intervals, is caused tomove H Ot necessary for understanding the invenin the direction of theaxis of the papel` tube tion and which are known as to their action,

so as to be introduced into the slightly opened have not been shown. endof the tube. and then to grip the edge of F 1S the framework of themachine supthe upper layer in its middle whereupon it is Poftng theCooperatmg Parts l and 2 are caused to perform a swinging circularmovef'edmg rolls for repeatedly and 1n 3g Step' nient by which thegripped layer is pulled WS@ manner feedmg the Paper tube 3 1U 'the overthe edge ofthe ruler. It has been found dlrectlon of the arrow 1n Fgs- 1t0 3 4 1S a stationary knife which cooperates with a rethat on accountof the slight tension 1n which ciprocating knife 5, the latter beingperi0di the paper is kept any tearing of it is avoided. c

i ally moved up and down by known means Aften this Swmgullg moverlentthe uur of (not shown) after the paper has been pushed 8( grlppfrsfsthan. le else( an lll'elurne forward for the length necessary for form-SVlngmg gUPPelS are We nown m @he ing a paper bag beyond the cuttinglevel of paper bag machine art, even these which the knives 4, 5PQI'OI'm a 1`eC1P1'0Cat-mg a? Wen as. a SYVmg' For simplicitys sake inthe following the 4o ing movement. The invention consists .in thecooperating parts may be described in concreating of a machine 1n whichthe grippers nection with the description 0f their Cooperare so arrangedas to clutch the edge of a ation: layer of the tube in its middle, andthen to The paper tube 3 formed at the righthand erforin a swinging.movement around the of Fig. 1 by known means is pulled forward frontedge of the folding roller and the orossby the above mentioned feedingrolls 1 and tia 2, and in this forward movement it surrounds the sheetmetal form or gauge 6, the shape of which has been shown in dottedlilies in Fig. 3. rlhe feeding rolls 1 and 2 are periodically drivenfrom the continuously rotating main shaft M of the machine by means of acrank disc A with adjustable crank pins B and a rod C pivoted to atoothsegment D supported at E in the framework of the machine, which, bymeans of the tooth-wheel G operates another tooth-wheel which has thesame diameter as the feeding roll 2, and which is so arranged upon theshaft of this roll that it only drives the same if the crank A, B swingsthe segment l) opposite to the direction of the clockhand in Fig. 1.During the swinging movement the paper tube 3 is fed, whereas thefeeding rolls are kept stationary when the segment D is rotated in thedirection of the clockhand.

'lhe two feeding rolls 1 and 2 are geared together in such a way thatthey simultaneously rotate inversely. The roller 1 is sup` Vported by alever 1 in such a way that it may be elastically pressed by its ownweight or other well known means against the upper side or layer of thepaper'tube. This feeding device is well known.

After the described feeding device 1 and 2 has fed the paper tube for alength dependent on the adjustment of the pin B at the disc A and hascome to a standstill, then the knife 5, which up to this moment was in alifted position, is moved downward cutting off between itself and the.under-knife 1 the fed length of the tube. whereupon the knife 5 is atonce lifted again. Now the devices which are significant for the.present invention become operative. These devices comprise pins 7arranged below the front end of the paper tube close to the cuttingdevice 4, 5 periodically moved up and down, and one pair of grippersforming tongs 8, which performs areciprocating as well as a swinging oroscillating movement. These parts in their action are co-operating withthe. gauge 6 within the paper tube and a ruler 9 situated close to theupper side of the tube.

As soon as the knife 5 is lifted, the two pins arranged at both sides otthe middle line or axis of the tube, as may be seen from Fig. 3, arelifted so as to meet the underside of the papel' tube outside of thefront edges 6a of '1 the gauge 6 arranged at a right angle to each otheras shown in F ig. 3. By this. the tube at its eut` front edge is slightly opened as outlined in Fig. 3 so that its upper layer is liftedaway from the gauge 6. B v this.v the said layer is brought into aposition in which it. may be gripped by the tongs or pair of `grippers8.

This pair of grippers is supported sidewise from the paper tube and thesheet metal gauge 6 by an arm 30, rotarily arranged upon newbie a shaftH supported by the framework F. A projection 29 of this arm 30 isconnected by means of a link 26 to a double-armed lever 25 rotarilysupported at 25 in the framework F and bearing at its end remote to thelink 26 a roll being held in operative connection by any well knownmeans (for instance by springs which are not shown) with a cam disc 28rotated from the main shaft M by a gearing, which has been shown in Fig.1 but which needs no further description. This cam disc 28 is soarranged that it'brings, immediately after the operation of the knlfe 5,the lever 25 from the dotted position shown in Fig. 2 into the positionshown in full lines in the said figure, so that the arm 30 with the pairof grippers 8 is moved for a short way from the left to that position inwhich it has been shown in Figs. 1 and 2; during this movementthegrippers are held separated, so that they may embrace the lifted upperlayer in its middle at the point 10. When this has been done the pins 7,which may be operated for instance by a cam mechanism (not sh own) fromthe main shaft M, or which may b e dependent on the driving means of theknife 5 in such a manner that they are only lifted when the knife 5 hasbeen completely lifted, may be sunk again below the level in which thepaper tube is fed.

Between the arms 20, 21 of the grippers a compression spring 22 isarranged in such a manner that it always tries to keep the ends closed.The said pair of grippers is rotarily supported upon a shaft 30 arrangedat the upper end of the arm 30 and is in connection with a. sprocket orchain-wheel 14 supported by the same shaft. A chain 15 connects thissprocket wheel with another sprocket wheel 16 rotarily supported by theshaft H. and an adjustable crank pin 16 of this wheel is engaged b v arod 19 provided with a roll 18 at its other end. which is constantlykept in' contact with a cam disc 17 on the. main shaft lid. Here as wellsprings or the like secure the continuous contact between roll and camdisc 17. Means of this character are well known in the art.

rThe periodical reciprocation of the rod 19 caused by the cam disc 17periodically oscillates the chain wheel 16 and 14. r1he parts are sodimensioned that the osciliation of the wheel 14. and therefore that oi:the pair of grippers 8. embraces an angle of about 180. Approximately atthe end of the oscillation in one or the other direction. the arms 21.22 respectively. meet fixed but adjustable stoppins 23. 24 respectively,at a cross-piece 30 of the arm 30. whereby the spring 22 is comt pressedand the gripper-s opened.

ln Figs. 1 and 2 the moment has been shown in which the arm 21 of thepair of grippers has been introduced b v the swinging movement into theopened end of the paper tube (see Fig. 3) just after it has left the pin23,

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Fig. 5, so that the diamond fold is made.

The point of the front edge caught by the pair of grippers has thenreached the point connected with the upper end of the lever, thegrippers having their gripping ends bent toward the longitudinal axis ofthe tube for gripping the tube at its longitudinal axis, means forswinging the lever to move the gripping ends into and out of grippingposition, means for swinging the gripping ends to and fro after beingmoved into gripping position, and means to release the gripping endsfrom gripping position after the initial part of the to and fro Swinginf movement. FRITZ I-I LSGHER.

11 in Fig. 5. In this moment the arm 2O has impinged upon the stop 24and has opened the 15 grippers again. At the same time the drive for thefeeding rolls l and 2 becomes operative again and the front edge of thetube, now provided at its front end with the diamond fold is drawnforward to the left for one paper bag length, which is then cut off bythe cutting device 4, 5 as described above. The diamond fold is passedthrough a pair of rolls 12, 13 and delivered to a pair of conveyingbands J (outlined by dotted lines), passed over a number of guidingrolls K and driven in any well known way by the main shaft. Theseconveying bands deliver the cut olf part to a gluing device L andfolding device N, which do not form a part of the present invention andwhich finish the forming of the square bottom.

The diamond fold when it has left the rolls 12, 13 is secured againstopening by means of a reciprocating finger O arranged .closely to theoperating table P of the machine and reciprocated from the segment D bymeans of a link R. At the time during which the knife 5 is operated, thelever 30 with the pair of grippers at its free end has been swung againto the left by the cam 28 and the cam 17 has swung the pair of grippersaround the pin 30', so that the grippers have returned again to theirinitial position, thus the described play can begin afresh.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States is A machine for making apaper bag with a square bottom comprising intermittently operatedfeeding rollers for advancing predetermined lengths of a paper tube, acutting device including an intermittently operated knife and astationary knife cooperating to cut an advance length of the tube, astationary rule determining the cross diagonal of the diamond fold forthe square bottom, a

sheet metal gauge engageable in the tube and having inclined front edges4merging at a point adjacent the cutting device, a pair of verticallyrcciprocable pins between the cutting device and gauge and periodicallymovable toward the tube to open the front edge thereof after eachoperation of the cutting device. a pivotally mounted lever, a pair ofgrippers arranged in tong form rotatably

